| The subject of nonequilibrium and nonlinear is very usual in the field of science. It has attracted the attention of researchers for many years. One important investigation is that of chemical oscillation. There has been a focus on the theoretical and experimental chemical kinetics in recent years. Studies of oscillating chemical reactions are application of regular chemical reaction to analytical determination and designing new oscillating chemical reaction. The paper report the effect of benzidine on the B-Z oscillating chemical reaction; determination of p-nitrobenzene-azo-naphthol and alpha-naphthol using the H2O2-CUSO4-KSCN oscillating chemical reaction; A novel chemical oscillator with phenylalanine was also represented. Part I Oscillating chemical reactions and their application in the analyticalchemistryThis literature review provides a brief introduction to the development of the oscillating chemical reactions. Some theoretical model, thermodynamic parameters and their applications are described in detail. The perspective of oscillating chemical reactions is discussed to the point. Part II Effect of benzidine on the B-Z oscillating chemical reactionA simple and sensitive analytical method for the determination of benzidine with the perturbation caused by different amounts of benzidine on the Belousov-Zhabotinskii (BZ) oscillating chemical system, involving the Ce(IV)-catalyzed reaction between potassium bromate and malonic acid in a acidic medium is proposed. Results show a good linear relationship between the change in the oscillation amplitude of the system and the concentration of benzidine. The calibration curve is linearly proportional to the concentration of benzidine over the range 3.5x10-9 -1x10-4M, with a regression coefficient 0.9975. The optimum conditions for the determination have also been investigated in the B-Z reaction system. Influence of temperature, and variable reaction conditions are investigated in detail and the possible mechanism of action of benzidine on the chemical oscillating system is also discussed.Part III Determination of p-nitrobenzene-azo-naphthol and alpha-naphthol on H2O2-CuSO4-KSCN oscillating chemical reactionA simple analytical method for the determination of p-nitrobenzene-azo-naphthol andalpha-naphthol was proposed by a sequential perturbation with different amounts of them on an oscillating chemical system. The method involves a Cu(II)-catalysed oscillating reaction between hydrogen peroxide and sodium thiocyanate in alkaline medium with the aid of continuous-flow stirred tank reactor (CSTR). And it relies on the linear relationship between the changes in the oscillation amplitude and period of chemical system and the concentration of p-nitrobenzene-azo-naphthol. The calibration curve fits a linear equation very well when the concentration of p-nitrobenzene-azo-naphthol ranges from 5.2x10-7 to 3.3x10-3M. It relies on the linear relationship between the changes in the oscillation amplitude of chemical system and the concentration of alpha-naphthol. The calibration curve fits a linear equation very well when the concentration of alpha-naphthol ranges from 3.4x10-8 to 5.3 x10-4M. The use of analyte pulse perturbation technique provides the possibility of sequential determinations in the same oscillating system, owing to a new steady state was reappeared rapidly after each perturbation. Influence of temperature, injection point, flow rate and reactants variables on this system were investigated in detailPart IV A novel chemical oscillator with phenylalanineStudies on nonlinear behavior at oil/water interface membrane were performed. This system showed rhythmic oscillations and chaos of electrical potential in a given concentration domain. The nonlinear behavior response at the liquid membrane apparently resembled that of biological chemoreceptive membrane. The possibility of developing a new type of chemical sensor with the ability to simulate substance equilibrium in living organisms was suggested in the paper.
|
PDF Full Text Request